Click event to verify, delete, and include class identifier in angular13

Looking to enhance functionality by dynamically adding and removing the 'active' class to 'li a' elements on click. While the current code performs well when clicking from top to bottom, it fails to work in reverse order.

  1. component.html
<div class="container text-center">
  <ul id="myList" class="pt-5">
    <li class="p-3">
      <a href="#" class="d-inline-block" (click)="linkActive($event)">List 1</a>
    </li>
    <li class="p-3">
      <a href="#" class="d-inline-block" (click)="linkActive($event)">List 2</a>
    </li>
  </ul>
</div>
  1. component.ts
linkActive(event) {
    const activeClass = event.srcElement.classList.contains('active');
    const classFound = document.querySelector('li a');
    const hpn = classFound.classList.contains('active');
    if (activeClass == true) {
      if (hpn == true) {
        classFound.classList.remove('active');
      }
      alert('true');
      event.srcElement.classList.remove('active');
    } else {
      if (hpn == true) {
        classFound.classList.remove('active');
      }
      alert('false');
      event.srcElement.classList.add('active');
    }
  }

To see the code in action, visit: https://stackblitz.com/edit/angular-ivy-jf9xvp

Answer №1

Avoid direct DOM manipulation and instead utilize ngClass to achieve your desired outcome:

template:

<a href="#" class="d-inline-block" [ngClass]="{'active': activeList === 1}" (click)="linkActive(1)">List1</a>

.ts

public activeList: number;

...

public linkActive(listNumber: number) {
   this.activeList = listNumber; 
}

As suggested in the comments, consider completing the heroes tutorial to gain a better grasp of using typescript.

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